Cement.



' cnnssitrafici I06. COMPOSITIONS, Examiner COATING R PLASTIC UNITEDSTATES PATENT OFFICE.

WILLIAM H. ALLEN, OF DETROIT, IIGHIGAN.

CEMENT. V

1,261,750. srwiflmivn of letters Patent Patented Apr. 9, 1918. 80Drawing. Application flle'd December 12, 1817. 8eria11\"o.206,886.

To all whom it may concern:

Be it known that 1, WILLIAM H. ALLEN, a citizen of the United States,and residing at Detroit, in the county of Wayne and State of Michigan,have invented a new and- V ject is to provide a cement of this characterwhich shall be insoluble in cold or hot water or steam, which will notbe affected by. the atmosphere, which will become ver hard after it hasset, and which will cm a chemical or hysical ,union with the surfaces ofartic es of iron and steel when applied thereto.

My improved cement is formed of finely powdered iron oxid and phosphoricacid or any of the acid salts of phosphorous oxids,

the acid compounds of phosphorus bein diluted with water and the iron oxds mix therewith to a pasty consistency.

The preferred iron oxid is natural ma netite, which needs no treatmentexcept puverizing. Iron scale formed by heating iron or steel shouldfirst be heated to OX'lu'hTG all metallic iron therein. Hematite may beused, but the cement is less desirable th when Fe,O is employed.

I prefer a fifty per cent. solution of or'tnophosphoric acid, althou hthe meta or lecial acid may be used. f soluble acid phates are used, theacid strength will as near a fifty per cent. solution of acid as isossible.

his cement when set becomes very hard, and seems to'actually unite withthe surfaces of iron and steel to which it is applied, probabl becausethe phosphoric acid causes not on y the iron oxid but also the surfaceof the articles of iron or steel to change to basic ferro-ferricphosphates.

When the, cement is placed between two surfaces of steel, great force isrequired to separate them. 7

The cement may be used to fill cracks and holes in iron castings,especially where the cement is to be exposed to the action of hot waterand steam. The cracks in cylinder heads of automobile engines causedbythe freezing of the cooling water may be satisfactorily closed by thiscement.

If the above mixture is diluted with water and then a plied as a wash tometal surfaces, it wi l-fill all interstices and protect such surfacesfrom the elements. It is particularly valuable in protecting surfaces ofiron and steel from rusting. It will be understood that the iron oxidand the acid comlpounds of phosphorus will not be mixed unt' thematerial-is to be used.

I claim A cement composed of' powdered iron oxid and a solution of anacid compound of phosphorus. v

2. A cement composed of powdered Fe,O,, water and an acid compoun ofphosphorus.

3. A cement-paste composed of powdered -Fe,0,, water and phosphoricacid.

4. A cement composed of powdered Fe,O, mixed with a suflicient amount ofa fifty per cent. solution 'of phosphoric acid to make a paste.

WILLIAM H. ALLEN.

